chores: add security docs

[zwzhang0107]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.68%. Comparing base (d9c2971) to head (c1ab865).
Report is 60 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2007      +/-   ##
==========================================
+ Coverage   67.56%   68.68%   +1.11%     
==========================================
  Files         413      421       +8     
  Lines       46208    38899    -7309     
==========================================
- Hits        31221    26716    -4505     
+ Misses      12726     9865    -2861     
- Partials     2261     2318      +57     

Flag	Coverage Δ
unittests	68.68% <ø> (+1.11%)	⬆️

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[hormes]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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